Myths vs facts: Zöliakie Test and blood sugar

Myth: A celiac test measures blood sugar. Fact: Celiac tests (e.g., tTG-IgA) detect an autoimmune response to gluten, not blood glucose. However, there is a well-established link between celiac disease and type 1 diabetes (both autoimmune). Untreated celiac can also cause blood sugar fluctuations (hypoglycemia, postprandial hyperglycemia) due to malabsorption and gut inflammation. A blood sugar test (fasting glucose, HbA1c) is not a substitute for celiac diagnostics. Evidence for these associations is moderate (epidemiological studies, no RCTs). Caveat: A positive celiac test does not automatically mean diabetes; both need separate evaluation. Direct-to-consumer celiac tests have higher false-positive rates and should be confirmed by a physician.